Air Quality Measurements

Hardware used

Find the proper device holding the SDCard: lsblk
FAT format an sdcard: sudo mkfs.fat -F 32 /dev/mmcblk0p1
Copy the image to the device (not partition) sudo dd bs=1M if=2020-08-20-raspios-buster-armhf-lite.img of=/dev/mmcblk0 conv=fsync
Mount the card and access the boot partition
Add an empty file named ssh to enable ssh at start up: touch ssh
Use wpa_passphrase to generate the wpa_supplicant.conf to put in the same location:
- wpa_passphrase <SSID> <passphrase>
- The file looks like this:

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=US
network={
	ssid=***
	#psk=***
	psk=***
}

Secure raspberry https://www.raspberrypi.org/documentation/configuration/security.md
- run passwd
- change hostname in /etc/hostname
- install ufw firewall: sudo apt install ufw
- allow ssh and enable: sudo ufw allow 22 && sudo ufw enable
Update software: sudo apt update && sudo apt upgrade
Allow I2C module via sudo raspi-config
Load tools for i2c debugging: sudo apt install i2c-tools
- list your buses: i2cdetect -l
- list connected hardware: i2cdetect 1 (1 is my i2c bus number)

Install virtualenv: sudo apt install python3-virtualenv
Create project folder and environemnt: mkdir aqm && cd aqm && python3 -m virtualenv .aqm_env

Install the python module for the corresponding hardware in the project’s library: source .aqm_env/bin/activate && pip3 install adafruit-circuitpython-pm25
Run test code test_pm.py

docker run -it –rm –link some-postgres:postgres postgres psql -h postgres -U postgres

docker run –name some-postgres -e POSTGRES_PASSWORD=test -d postgres

create database aqm;

\c aqm

docker run –name my-grafana -p 3000:3000 -d grafana/grafana